Can not kill LA......Running on

Hmmm,

So, why would the ignition timing have any effect on the engine after the ignition is shut off? There ain't any electricity running thru the ignition after the key is shut off. So adjusting the timing wouldn't do jack... Would it? I don't think so. I vote carbon depositization as well. The carbon remains burning in the combustion area after the ignition key is shut off. To cure carbon depositization: pump it full of 90+ octane, drive the car with the breather off and the hood off, in a rain storm at w.o.t. for 10 to 20 miles. Then replace the spark plugs. Water exploding (turning to steam instantly) in the combustion chamber adds additional simulated compression and creates a little more intense combustion environment.. If the breather and hood cannot be taken off prior to a rain storm, just drive the car at w.o.t. for a number of sessions on long straight aways at 4 am, preferably with a free flowing exhaust system. I have seen many chunks of carbon fly out tail pipes and other exhaust accessories, on cars that are carboned up after we purchased them from old ladies or old fellers and had to blow the cobs out of them. Looked like the cars had roman candles up their tail pipe(s)... :)
It is preferable to do this type of de-carbonization on a rainy day because carbon chunks can light the side of the road on fire.